On Pluto, electrical, crystal beings like these Plutonian Zistles would find -250 C too hot for comfort. At night, when it's colder still and electricity flows perfectly, zistles feel best. Highly intelligent, they spend most of their free time radioing great thoughts to each other. When Zistles do get going, they can spring 20 meters high in Pluto's feeble gravity. Zistles think Pluto is the only planet with life - it's too hot everywhere else!